diff --git a/LIBGTOP-VERSION b/LIBGTOP-VERSION
index d28764e6..e3c74e40 100644
--- a/LIBGTOP-VERSION
+++ b/LIBGTOP-VERSION
@@ -18,7 +18,7 @@ LIBGTOP_SERVER_VERSION=1
 
 # Don't change this
 LIBGTOP_VERSION=$LIBGTOP_MAJOR_VERSION.$LIBGTOP_MINOR_VERSION.$LIBGTOP_MICRO_VERSION
-LIBGTOP_VERSION_CODE=$(($LIBGTOP_MAJOR_VERSION*1000000+$LIBGTOP_MINOR_VERSION*1000+$LIBGTOP_MICRO_VERSION))
+LIBGTOP_VERSION_CODE=`expr $LIBGTOP_MAJOR_VERSION*1000000+$LIBGTOP_MINOR_VERSION*1000+$LIBGTOP_MICRO_VERSION`
 
 # For automake.
 VERSION=$LIBGTOP_VERSION